Pakistan
slightly less than twice the size of California

Palau
slightly more than 2.5 times the size of Washington, DC

Panama
slightly smaller than South Carolina

Papua New Guinea
slightly larger than California

Paracel Islands
NA

Paraguay
slightly smaller than California

Peru
slightly smaller than Alaska

Philippines
slightly larger than Arizona

Pitcairn Islands
about 0.3 times the size of Washington, DC

Poland
slightly smaller than New Mexico